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JAMB - Chemistry (1981 - No. 21)
Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)
1s
2
2s
2
2p
6
3s
2
1s
2
2s
2
2p
6
3s
2
3p1s
2
2s
2
2p
6
3s
1
1s
2
2s
2
2p
6
3s
1
1s
2
2s
2
2p
6
3s
°
1s
2
2s
2
2p
6
4s
1
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